Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail)

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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within one year, Amortized Cost $ 699  
Available-for-Sale Over one year through five years, Amortized Cost 27,879  
Available-for-Sale Over five years through ten years, Amortized Cost 74,439  
Available-for-Sale Over ten years, Amortized Cost 32,280  
Available-for-Sale, Amortized Cost 511,511 549,113
Available-for-Sale Within one year, Estimated Fair Value 728  
Available-for-Sale Over one year through five years, Estimated Fair Value 27,642  
Available-for-Sale Over five years through ten years, Estimated Fair Value 72,430  
Available-for-Sale Over ten years, Estimated Fair Value 30,667  
Available-for-Sale, Estimated Fair Value 505,977 530,926
Collateralized mortgage obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 160,422 130,636
Available-for-Sale, Estimated Fair Value 159,625 127,693
Mortgage-backed securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 215,542 222,768
Available-for-Sale, Estimated Fair Value 214,635 217,059
Equity security [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 250  
Available-for-Sale, Estimated Fair Value $ 250